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There are over 20 condominiums in Key Biscayne - primarily on the East where it meets Atlantic Ocean.

Currently, there are 71 homes offered for sale - from 1.599M to 27M.
The property you inquired about at 7 Harbor Point is a gorgeous 7 bedroom, 10 baths house of over 10,674 sqft. The lot is 22,860 sqft and it has been on the market for 67 days on 04.28.14.

It's hard to actually count homes (we'd need to go into Miami Dade tax records and actually count them - but the info their won't mention if the water view is canal or wide bay, f.e), but I can give you the names of the streets that offer waterfront views. S. Mashta Dr. faces Biscayne Bay Acquatic Preserve. N. Mashta Dr. faces same and also a harbor like inlet. Harbor Point, Bay Lane and Harbor Dr. face Biscayne Bay. Cape Florida Dr., Knoll Dr., Island Dr., Mariner Dr., W. Matheson Dr., and some W. Mashta Dr. homes face a canal. Homes are on the West side of the Island and the best views being those of Biscayne Bay. Surrounded by Bill Baggs Cape Florida State Park on one side, and Crandon Park on the other side, Atlantic and Biscayne Bay on East and West - Key Biscayne is one of the most desired areas in Miami.

The best way to travel to Key Biscayne without living your home is to go on Google Earth.
You can literally move from one street to another while in the program. The next best thing is to come and see this beautiful area for yourself, in person.